Thirty is not too old for a master’s. Many students start graduate school in their 30s, some straight from work and some after a break from school. Your work experience can be an advantage, since you can connect coursework to real problems you have already seen.
The main challenge is logistics. Balancing classes with a job, and possibly a family, takes planning. Part-time and credible online master’s degrees exist for exactly this reason. Build a schedule you can actually keep, and line up support before you start. Students returning mid-career should also plan for overcoming age bias in the job hunt.
The investment can pay off, but only if the degree fits your goals. Research salaries and demand in your field, total your costs, and talk to recent graduates of the programs you are considering. Review the ROI of a master’s degree for your situation. Age is not the barrier. A bad fit between the degree and your plans is.

