Only if youre in your teens where one or both parties are still a minor or below the age of consent, and even just a couple of years can be a very large difference in development. Two years is pretty much the same age for all intents and purposes.

Is a 2 year age difference a big deal?

Its pretty common to date someone whos a few years younger or older than you, and often the age difference is no big deal. An age difference of a few years may not seem like an issue, but things such as expectations, priorities and general interests can change quickly as you get older.