Why are young men (25 years old) attracted to older women (40+ years old)?

Why do younger men find older women attractive? I don't get it. I'm young, hot and fun! I mean c'mon I shouldn't have to compete with old women, should I? I have been dating this guy for almost a year and we spend every weekend together and some times we see each other during the week. We went out this past weekend drinking and I on accident discovered he was texting this older lady. (by process of investigation I found out she's 40 years old) So the convo went as follows: in June she text him saying her grandpa had a heart attack and he responded I'm sorry to hear that. Then in late July he text her saying he saw a lady at the bar that looked similar to her but "not as hot" and she's like I'm glad not as hot ha ha then he's like hope all is well with you and she's like you too. End of conversation.. no phone calls or anything else between them> He was a t the bars with me that night the previous weekend and we did talk to some older ladies therefore I'm sure that's where that came from. Should I be worried about this? Or is this just small talk and nothing more. I really don't think he would ever act upon it he has always been straight forward to me about everything.
Why are young men (25 years old) attracted to older women (40+ years old)?
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