nothing official has given an age for either of them. jason is an army veteran who then spent time working for smugglers which means at minimum late twenties and probably thirties
lucia has done a prison sentence and got out, which also implies not young. but the way theyre drawn reads younger than that to me and i cannot tell if thats art style or if im wrong about the timeline
two people in their thirties trying to start over is a much better story than two twenty year olds having a great time and rockstar knows it
No age has been given for either. Your inference from the biography is the only method available and it lands them somewhere in their thirties at minimum for Jason.
Service, then a period working for smugglers long enough to be established in it, then meeting her. That is not a short timeline. Mid thirties would not surprise me.
reading younger than they are is probably just how modern character rendering works. everyone looks thirty two now
The prison sentence gives Lucia a hard minimum too. Sentence plus release plus whatever came after is years, not months.
Rockstar protagonists have skewed older with every game. V's leads were middle aged and that was deliberate.