- Namo tassa bhagavato arahato sammā-sambuddhassa -
One who starts to serve worthy things, outwardly and inwardly, starting with outwardly, is sure to increase Upanissaya, sure to arrive there of what he/she had served. Having, doing not serving of what is worthy to, how could one ever arrive, ever ordain/attain? It would simply die out for one, inwardly and outwardly soon.
As soon as such desire, desire for going forth under the tripple Gems for liberation from suffering, wholesome mind, kusala mind arises, go after it, don't wait a moment, no need to worry much on failure or to be perfect before going to train at the highest school.
What ever age, what ever condition, seek for it, as soon as it arises, and for all who desire are ways to arrive there, at the holy live and eventually liberation from suffering, desire leaving home, leaving stands.
Three things are praised by the wise: giving and help for parents (serving) and renouncing, going forth.
Be quick! (the story of Veen. Maha Kasspa and his Ven. former wife in previous life) Seek and take the possibility if such desire arises and avoid what ever hindrance and people telling otherwise.
Be quick in doing
Restrain your mind
from what's evil.
When you're slow
in making merit,
evil delights the mind. dhp
All you could lose is to return where so long, long returned, again and again. So this path has even a "payback-quarantine" if it does not work for you yet, missing Upanissaya, something that needs to be nourished and gone for, again and again, till met.
Others then many advises (sadly even monks and those who should be informed, appearing as teacher), the Buddha did not allow his monks to teach much in regard of Vinaya (rules for monks) for one who desires for going forth. So such is only good if wishing to prepare yourself meanwhile, till finding the possibility.
Look also at: How to ordain as monk?
The inspiring story of Yassa and many others after him here: Mv I 07: Pabbajjākathā — The Discussion of Going-forth
And don't fear possible disrobing, as you could try anew with more inclination for seven times.
(Note that this gift of Dhamma is not dedicated for trade, exchange, stacks or entertainment but as a means to make merits toward release from this wheel)