Is ageism a thing or is it just the fact that in every industry there is a push to move up the ladder? You are just not supposed to be doing grunt work at 50. T

Is ageism a thing or is it just the fact that in every industry there is a push to move up the ladder? You are just not supposed to be doing grunt work at 50. This is true of all professions. People below you don't want you to be occupying their spot, and people above you have a hard time with a guy who is senior to them in age and experience.