A lot of PGCE students are far older tha 30! You would be one of the younger ones on the course.
I did half a PGCE because I found that I truely hated teaching. However don't let that put you off.
The reason that teaching didn't suit me was that I found it really nerve racking standing up in front of 30 children. You might wonder why I didn't guess that would be the case, but in my previous job I was confident enough to talk to an audience of 100 sciencists who were going to pull my work apart.
I think that to be happy teaching you need a lot of stamina and to enjoy acting. Teaching is not a child friendly job. The hours are horrendous and you miss your own child's concerts, sport days etc. You also have to attend parent's evenings.
There are lots of other jobs in a school. For example I work in school ICT. The pay is awful, but I only have to work 37 hours a week and I get 11 weeks holiday. Unlike a teacher I can ackew flexi time so I can do things like getting the day of when ds is sick. My plan is to move into the better paid private sector when my son is secondary school age.
There are othe other jobs like being a libary assistant, pastoral support, admin jobs, school attendence officer, lab technician, LSA.
Soon there will be schools all over the country that need exam invigilators. Working as an exam invigulator is a great way of seeing what a school is like and getting experience with kids.
School jobs are very competitive because a lot of mums want term time work.