I think 2-3 years are fine. If your age gap is more than 5 years, you will have a lot of complications in life. The difference in age gap will also create differences in temperament, interest, etc.
 
If even age doesn't seem like it matter about being mature, I'm still never going to be interested in getting into a relationship with someone too younger or too older more than 10 years.
Age doesn't matter and I can never date someone that's too old because it will be too boring or someone that's too young because it will look as a childish play.
 
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What age would you consider to be too old and too young for you to date someone?
For me, my partner can't be older than me with 6 years, anything that's more than that looks old in my eyes. I can't be older than my partner with 5 years because it will look like we are doing childish play.

I know it will work for other people but to me, I never like it that way.
 
I tried dating a 19-year-old when I was 29. That didn't go over well. I should've realized someone that age just coming into the fruition of adulthood would still be immature and lack understanding of certain aspects of human beings. I would probably only date someone 5 - 7 years younger/older than me at this point.

Yeah 10-year age gap can be challenging even if age is just a number. But maturity levels and life experiences matters here. I don't really care about the age, if I’m able to get want I wanted. I’m fine!