There is nothing like taking classes to maintain technique. Yet, some like myself teach so much it is difficult to have the time to attend class regularly. So our workouts are part of teaching, or for me I do 200 kicks between classes and work my patterns 3 days a week. Demonstrating for students while I teach 5 classes a week is also a workout.
I think teaching a kids class taks 3x the energy of taking one class. Then there is also the opportunity to travel a few times a year for classes or seminars. (Attended at least 30 non TKD Seminars, some were an hour or two , some were several days) So, yes I consider that with this schedule of teaching since 1994, and before that attending classes 3x a week, I have been training regularly and steadily since 1971. (A few breaks for injuries,vacations and surgeries. Most were a week or two, longest was 2 months. Probably less that 6 total. )
There is one gentlemen in Chicago, KS Shin, who oponed his school in Chicago in 1968, and has been training regularly since the 1950's (He makes "Bear Brand" Uniforms) He heas been on the amt regularly since the 1950's - Not BS.). We should all do that well when we are in our 70's.