The right time or age?

It is said that there is time for everything, but some things just happened unplanned. When we grow up our parents often say do not rush into things. Well I don't know if I'd agree with that, if something is happening at that time then that means the time for that particular thing has arrived. Is there a right time to have a child? if there is who made that 'law'?; Is there a right time to start dating? who made that 'law/rule'?; is there a time to stop studying? is there a right time to get into marriage? is there a right time to loose your virginity? is there maybe a right age for one to be baptised? well all these things and many more are things that raise eyebrows and get people talking or often hear "she/he's too young for that or too old". What I would like to know is who actually 'set' an age for these things to happen. No one has control over such issues and I think nothing happens by mistake it is all up to the individual. If two people get married at the age of 19/20 years then it's their choice to get married because they feel they are ready. If a girl falls pregnant then it's because she feels ready to be a mother.if i want to be baptised at age 9 then it's my choice. I just think all these things are determined by maturity and willingness.