I'm not saying that. We know that Sanji came out of the timeskip as a 21-year-old. We also know that it was Tama's birthday the day Luffy and gang landed on Wano and Sanjii's birthday was a day before her, hence he should've turned 22 that day. This is considering that their birthdays are the same in verse which isn't confirmed. The timeline is obviously different, lol.