Can you make a career for yourself as a soldier being in your late 20’s

Hi Macaulay,

You can join as a Regular Soldier as long as you're enlisted before your 36th birthday. The majority of recruits are in their late teens/early twenties, but many (including myself) can and do join later. In my experience, soldiers who join at a later age tend to have more 'life experience' and be more mature, but other than that there isn't much difference.

Thank you for your response, what is the average age of retirement for a infantry soldier

A Full Army career is 22 years. The minimum service is 4. People do everything in between. Its totally up to the individual.