Both.
Cambelt needs doing every 5 years regardless of mileage. Or 70k miles to be safe.
Timing chain should ast life of car, but early models have been know to stretch and in some cases snap.
I would get it booked in for a cambelt change and water pump ASAP. Also consider a fuel filter too as they don't have an interval for change, but should be done as filters are designed to catch rubbish and will clog.