IF Formula to compare a date to a nominated date in the future in excel

In one cell I want a date ie: 31/03/21 I want the formula to be able to check that date and when it is X years so 31/03/2023 it can either colour code the box or mark as overdue I've seen this answer: Excel - Want to compare a projected date against a target date

But, this would mean we would have to put in the sheet for 1 year 365 days, 2 years - 730 days e.t.c . Is that the only way to do it or can you do some way for just year, two years etc...?

For some context, I work for a volunteer organization and all volunteers have to do various trainings every X amount of years. So, looking for an easy way to put them on a sheet with the training and have it colour change/highlight/mark as overdue when they come up every few years or so.

Much thanks