Thank you for your question
My name is ***** ***** I shall do my best to help you
No he is not dependent.
He is capable of work - and you no longer have to pay maintenance.
If you do wish to assist your son that is something you shoudl discuss with him directly
Please ask if you need further details
Things are a little different in Eire
This is a quote from a government website
"Maintenance can be awarded to a spouse/civil partner for their own benefit and/or for the benefit of a dependent child who is under the age of 18, or 23 if the child is in full-time education. If the child is over 18 and under 23 and the financial circumstances do not allow him/her to attend further education, maintenance can be applied for in order to facilitate further education. If the child has a mental or physical disability to such a degree that it will not be possible for the child to maintain him/herself fully, then there is no age limit for seeking maintenance for their support."
He is in fact capable of maintaining himself so all should be well
I thought he was in work?