Spanish won’t give you an advantage unless the company you end up working for has a studio or clients in a country that speaks Spanish. Even then, your number one job will be to design not interpret.
Chinese on the other hand would be helpful because most manufacturing is done overseas. Many designers travel to China to oversee development and initial production.
Age shouldn’t matter if you’re willing to start as a junior designer at age 29. I know few designers that graduated on their late twenties.
Cost and debt; that’s your decision. I chose CSU Long Beach to work part time while I went to school and graduate without student debt. I would recommend not working the last 2 years unless it’s a Design internship which will be way more valuable.
At the end, your portfolio will be the most important factor in getting you a job.
Good luck