I know this is not about Video Marketing directly. It is , however, something that can occur in any business or work venture and can creep up on you without knowing it. Burnout can have many symptoms including loosing the edge in your creative abilities and a loss of interest in your business. I experienced this in the corporate world and did nor recognise it at first. In me it expressed itself in boredom as the tasks became too easy and routine. 

Now I amount of the corporate world and have new challenges that have let me work at a higher energy level again. 

Source: How to Avoid Entrepreneurial Burnout, without Losing Business, or Your Health – Copyblogger

Take some advice if you are feeling close to burnout as shown by the article above. Not doing this can have serious consequences, no matter what your age.