Nearly 10 million new voters have been registered for the February 25 ballot, of whom 84 percent are young people aged under 34 -- a key block of ballots.
The election in Africa's most populous country is shaping up to be an exceptional event.
For the first time since the end of military dictatorship in 1999, a third party candidate is presenting a real challenge to the dominance of the ruling All Progressives Congress (APC) and main opposition People's Democratic Party (PDP).
With Nigeria struggling with growing insecurity, high living costs and increasing poverty, many young voters said they were more keen now to have a say about their future leader.
Crowds gathered at Lagos schools over the weekend where election officials called out names, checked off lists and handed out a coveted ID, the biometric Permanent Voting Cards or PVC.
Some would-be voters were successful but others were frustrated to be told to come back.
"They told me my PVC is not ready. They have to go back to Abuja," said Chuks David, a software developer in Lagos' Surulere area.
"We need to get things right, and that is why I am taking the time and the stress to get my PVC."
The Independent National Electoral Commission, known as INEC, last week extended the deadline for PVC collection by eight days.
In some states 100,000 cards were collected in just five days, it said.
Picking up her card in Lagos State's Alimosho district, first-time voter Gbemisola Akindola said she hadn't seen the need for change in 2019. But this year she said she was determined to have her say.
"Right now something is very very clear, that it's time we transition to the younger generation ruling us and that's why, if I don't do it now, when would I do it?"
Nigeria's elections in the past have been marred by logistical delays, violence and claims of fraud and vote buying.
In 2019, INEC was forced to postpone the election by a week just hours before voting was scheduled to start because of difficulty getting material to polling stations.
Election officials say 2023's ballot will be more transparent after the introduction of electronic transfer of results and a biometric voter identification technology known as BVAS at the voting stations to stop fraud.
"This instilled confidence in our people," Adenike Tadese, INEC head of voter education in Lagos, told AFP.
"I want to believe that is why our people are trooping out en-masse to ensure that they come out to collect this Permanent Voting Card."
- 'Great and proud' -
Whoever wins the presidency faces a host of challenges from tackling insecurity across the country to reviving an economy hit hard by financial fallout from Russia's war in Ukraine.
The security forces are fighting a 13-year-old war against jihadists in the country's northeast, bandit militias in the northwest and separatist tensions in the country's southeast.
Gunmen have repeatedly targeted local INEC offices in the southeast, burning voting materials in attacks often blamed on the Indigenous People of Biafra or IPOB separatist movement.
INEC warned earlier this month that the election risked postponement or disruption if security was not tackled. The government says measures are in place to guarantee the vote.
Buhari's APC has fielded Bola Tinubu, 70, a former governor known as the "Godfather of Lagos" for his political clout who will benefit from the ruling party's national network.
PDP's Atiku Abubakar, 76, is a former vice president and wealthy businessman who is on his sixth bid for the presidency.
Former state governor Labour Party's Peter Obi, 61, has appealed to younger voters with a message that he is different from his old guard rivals and wants to bring real change to Nigeria.
Voter turnout is often low in Nigeria -- it was just 33 percent in the 2019 -- and many younger people often say they feel little enthusiasm for candidates.
But two years ago, mass protests over police brutality spiralled into rallies demanding better governance known as the #EndSARS movement, a reference to the SARS police unit that was later disbanded.
Those protests were violently dispersed by security forces, but some of those involved in #EndSARS said the younger generation would be looking to the 2023 ballot box to make their demands.
"It's important that I play my part, and pick up my PVC," said Opeoluwa Adekoya, 27, in Surulere district.
"If things don't work out in Nigeria, yes, the government is to blame, but I have my responsibility."