Need to train more for a fair bit of time, coz while it is not that efficient to "shuffle", neither is it good to force a kick or decent knee-drive at slower speeds/cadences. Lots of variables, can search for it, from strengthening (i like resistance bands) to maybe even mobility exercises..........if not will get injured.
Maybe just try 3k first, then 5k, then 10k. If you find that longer distances are too hard for your age, 10k can be considered endurance long distance type of running also, it's like 1hr or low 1hr plus. The weather here terok also, so no shame in running and then doing well in 10k (or 5k for that matter).
I did a 16k last week, could only average 4.21 pace. Quite shiong, slightly over 1hr hard effort.
I do 1hr hard cycling already feel it quite siong, even with so much more wind cooling.