Changing careers at 15 years into a job, is it realistic? after 15 years as a data-entry clerk

After 15 years as a data-entry clerk I am thinking about moving into a different field. My family is supportive but nervous.

You likely have more transferable skills than you think. Write down what you did, not what the job title said.

Try a small project in the new field before committing. It told me a lot about whether I would enjoy it.