You know, age is to a big part only a number on a paper. It is a cliché, yes, but nonetheless a very true such one.
And not to forget to mention, people age differently too, and someone that is 40 on the paper may nonetheless be biologically or/and mentally younger than someone that is 25 on the paper.
Don't think about age so much just because others do, just let go and and if you like someone then you like someone and if that person likes you, than that person likes you, regardless of age.