I can't speak on behalf of the culture in Singapore, but a lot of more corporate countries (e.g. Australia) will want specific experience relating to the role and will bias their decision on X years in the industry - some of your knowledge and personal projects will translate but i doubt you'll have the foundations a lot of juniors will have received during their time. I don't know your specific circumstances but from personal opinion i wouldn't hire you as a senior without having experience tutoring junior developers, debugging others' code, understanding drawbacks of certain architecture decisions and (possibly) being a slow starter.

In terms of age, most newer companies (mine included - London) don't associate title to time served or your actual age, but your abilities. We've hired a junior who was then 29 and made a switch from being an accountant. He had the gist of how things worked and his personal projects looked promising. He completed the coding exercise in a language he was not familiar which demonstrated well his ability to problem solve; guidance was needed but he was were we'd expect a junior with no comp sci background to be. I myself am the youngest in our team by quite a margin (mid-20s) and am the Technical Lead - age isn't a worry. Just be prepared to be outdone/tutored by people young enough to be your children; at previous companies I've met people that have fought me on every aspect bc of that fact even though i was brought in to advise and fix their architecture issues.