I don't think age matters. My mom is married to someone 20 years younger than her. They met when she was 42 and he was 22. They have been married for 28 years. She was young and great looking at 42 (us 4 kids kept her young). My step dad is 8 years older than me, but has always acted much more mature than his age. In beginning I was 13, so a 22 year old was old to me and it never bothered any of us kids. Of course my mom is slowing down, she's almost 75 now, but acts much younger and looks much younger. My step-dad keeps her young, they have the most loving and respectful relationship I've ever known.
You have to choose for yourself not because of the age, but because of the person they are inside and the person they make you be when you are together.
Good luck!