Is it better to be a teenager now or in the past?
Nowadays we are living in a time when almost everything is changing and people needed to be aware about of all the different situations they (By 'they', are you referring to 'teenagers'? If so, say 'teenagers' instead of 'they' since you haven't mentioned teenagers yet) have to tackle. There are more opportunities, of course, but there also new problems to solve.
Certainly the educational system has changed and the teachers have to take care about of the needs of the students more than in the past years. But, even if the teenagers (or, you could say 'despite teenagers having more opportunities....) have more opportunities to studying using innovative and interesting tools, often they seem less motivated than in the past.
Probably the most important changes are related to the work situation. In these times (You could also say 'Nowadays...) the long term work is not the most so common anymore. Moreover they (again, who is 'they'?) need many skills because of the ever changing kind of work required.
Besides, the breakthrough of Information Technology and the overwhelming development of the social network have modified the way ('have modified the way WE...' or 'have modified they way 'TEENAGERS' communicate and socialize) to comunicate and to socialize.
Apparently the way of life of the teenagers now = the teenager's way of life now is more comfortable and safe and that’s true about the availabilty of food, services and tools, but I think it’s very important to consider that they are struggling on with new and sometimes very difficult challenges.