Hi Tell us what build you use - as there must be something not optimal if you struggle this season.
My Dance of knifes rouge normally do not do that well in T4
but this season even that build does pit 80 with just ok gear and pretty random masterworking.
And no age is not a factor as power comes so easy this season, so you do not need 4GAs and perfect stats for most stuff. That said, the thorn tarzan did take some time to learn so it can also be an issue you not triggering/maintaining buffs. Personally I think the season was ok but I had far more fun with chaos armor in the PTR then in live.