Why age now? If commands are happening at 1-2 years after joining, what difference does age make? Age was only a thing cause it meant financially other options were better wasn't it? But now BA seems to be offering quick commands that most would give their right arm for (apart from current BA employees strangely).
And so now you can make FO money on a part time Capt salary if you want so who cares about seniority or bid line. Or just kick back and as you work up the list you get all your weekends back.