This is actually a question that I myself just started having to figure out. There is no “real” answer. If I was going to give my “professional” opinion I would say, take a look at your genetic makeup. Take a look at the women in your family, your mother mostly. You can tell a lot about skin from what type your mother has or had when she was growing up.
For me, I was fortunate enough to have a mother that had/has really good skin; what I mean by that is, hardly any breakouts and just overall younger looking skin for someone her age.
I turned 29 this year and I swear that this is the year for dark circle treatments and skin tightening creams. This is not a complete lie. Earlier this year I started using anti-dark circle treatment and under eye gel to help minimize my dark circles. Is this related to age?? Probably not but its not a bad time to start preventing.
So the long of the short is that you can’t put a number on this type of stuff. 29 seems to be a good age for myself and most people my age might agree but it really depends on the person and their skin type.
A little bit of under eye cream never hurt anyone but I certainly wouldn’t go crazy if its not necessary.
If you have any tips for us and others on anti-aging treatments then please let us know!