I might be 32 years old with arthritis biting through every finger, but I read the reviews of people who say this game is unfair and tough, and I laugh. Not because I find this game is easy. It's not. It is, according to my game-ometer, "quite difficult". I laugh because this game is a classic atypical platformer and as such necessitates such a difficulty. It requires skill, reflexes and intelligence to master. Skills I had developed decades ago on 8-bit computers, but lost in the recent generation of 32 bit, "save where you want" gaming. Skills I once again found whilst playing these gems.
If you want to understand the platforming genre and realise why the older generation of gamer is so much better than you, if you want to develop skills of self control and tolerance, if you want to play a game with warmth and humour, then these are that game you need to play.