In some countries, age is an issue, or perhaps more correctly "age commensurate with experience".
eg, in Australia, starting at 40 would be considered too old to have a viable career where as 25 is better, 20 ideal. (Note, these are generalisations)
You will need a "buffer" in your age, that is, you need to be young enough to weather the financial storms that blow every 7-10 years dumping pilots onto the market. It is therefore a smart move not to be carrying too much debt so you are flexible in where you go and what job you pick up.
Research the countries where you intend to work and find out their normal hiring policy.
Holding off for a couple of years won't hurt so long as you save your money so you can hit it full time. Otherwise, you may as well start sooner and do it part time.