[mother, father] vieillissant (e)
→ John lives with his ageing mother.
[population, workforce] vieillissant (e)
→ A national pension fund was set up to cater for the ageing population.
→ The industry has been hit by a skills shortage because of an ageing workforce and falling recruitment levels.
[car] vieillissant (e) , en fin de parcours
[aircraft, ship, machine] vieillissant (e) , obsolescent (e)
→ The ageing aircraft need frequent safety inspections.
→ the country's ageing nuclear plants