Yes they do wear,and as they get worse, they have increasing difficulty in engaging the ring gear.
The teeth should have an incline that lets it slip into engagement but because there is a good chance that occasionally the teeth will hit the clutch plate bang on, they start to round off.
A common fault people do when starting is, if the starter doesn't engage first time, they don't let the starter come to a standstill before trying again, which means the bendix is still spinning when they try to restart and it will most probably ride on the ring gear again as the bedix absorbs the energy because it is spinning.
It could be that if your starter hasn't been serviced and the oil seal is perished, the bearing may have started to seize and this will absorb energy needed to throw the bendix.
Are you sure the battery is in good nick?
if it's chassis mounted, it could have damaged plates and will run the ignition side of things but not give enough amps to operate the starter.
If the commutator on the starter is contaminated and dirty it will also absorb energy.
Parts are expensive so getting to the source of the problem is critical.
My number is 07759361238 if you think I can help further.
Bear in mind this weekend is Rye House so I can't respond until the night time.
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