Yes, anyone can do freelacning.
Can use parents bank accout, to receive payments.
Yes any age group can do freelancing.
Show your previous works, results, portrait yourself as expert in your fields.
Its up to you, but ATNO will suggest not to do so, take both of the things simultaneously.
You can use Paypal | Payoneer | Wise to accept International Payments.
There is no right or wrong age to do freelancing, do when ever you feel like doing it.
In India, anyone who is earning more than 2.5 lakh needs to pay taxes.
You may need Pan card to accept international payments.
If your freelacning income is more that 10 lakh per annum than you must take GST number.
Yes, you can start freelacing in phone, but to deliver best quality work, it is advisable to get a laptop.