It could very well be a newbie thing.

If you your shoes are too small, or even too tight, it can hurt your feet and ankles. Your feet get bigger as you get older, and they get bigger as you walk throughout the day, so you might try double checking the fit and adjusting your laces when you start feeling some pain.

Some decent aftermarket insole might help. New shoes these days are coming with some pretty junky insoles, so that may be well worth a try too.

Finally, if you've not walked much lately your ankles could be just plain old weak. Walking will strengthen them up.