What do you think is the ideal age to start having children?

Alicia • I love helping others, sharing my knowledge, and learning new things. 😌
I want to know your opinions on when do you think is the ideal age to start having children.  
That is, considering the factors of: 
1. Having a stable job
2. Being married (or not)
3. Emotionally and physically ready
4. Knowing that it's time to take care of someone other than yourself. 
Etc...
Please comment below the specific age or range you chose and why. 
OR
If you think it should be unexpected, as in, if you just found out you were pregnant under any circumstance, then that's the time that you'll start having children. 
Also, what age do you believe is too young to start having children?

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