My boyfriend is 3 years younger than me, is it ok?

We love each other but I have doubts because :

- he is younger, but much more experienced ( I was virgin when we met)

- some friends tell me "ah he is younger, leave him find someone serious " or laugh when become to know he's younger

- one day he may realize it's a turn off having elder girl?

what do you think?
My boyfriend is 3 years younger than me, is it ok?
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