So to me, age is just a number!! When it comes to sex, a lot of people check the age difference first. If you have the understanding that sex is just an activity to be enjoyed like every other pleasurable activity then I think you will enjoy it to the fullest. But when age becomes an issue then you might just be having the half empty glass. Keep in mind that older is not always better and neither is younger. Like art, good sex requires skill and its nothing to do with age or size or even depth, but that's a subject for another entry.
As long as one is an adult and able to make decisions by him/herself, then please don't write them off based on age. The truth is, the best sex you might ever have will be with that younger/older person so at least test for maturity before you dismiss anyone!