The Pokemon's level is one indicator...although some don't level up very quickly whereas others progress extremely quickly. And with some it depends on the strength of their bond with their trainer...
[She shakes her head. She doesn't really know, since her studies have been more into Pokemon evolution and the plants they eat rather than on their ages.]
You would probably be best off asking an Analyst or someone with the appropriate medical training if you want to determine their age. Just because they're in the first stage of their evolutionary line doesn't necessarily mean they're very young. My Vileplume stayed as an Oddish for a long time and only evolved after I started traveling with her and training her more.
[Video]
[She pauses and considers that question.]
The Pokemon's level is one indicator...although some don't level up very quickly whereas others progress extremely quickly. And with some it depends on the strength of their bond with their trainer...
[She shakes her head. She doesn't really know, since her studies have been more into Pokemon evolution and the plants they eat rather than on their ages.]
You would probably be best off asking an Analyst or someone with the appropriate medical training if you want to determine their age. Just because they're in the first stage of their evolutionary line doesn't necessarily mean they're very young. My Vileplume stayed as an Oddish for a long time and only evolved after I started traveling with her and training her more.