Your age is not a block to training as a clinical psychologist (if that's what you want), life experience is often helpful. However you'll need some experience working clinically (not necessarily with children, that can come later on the doctorate) as without that you are very unlikely to get a spot training (especially if you are geographically limited as to the courses you can apply for - luckily there are quite a few in south eat, depending where you are). Research is a valid pathway to training too - working as a research assistant if the project has clinical contacts (such as working with a mh population with face to face contact, etc). You don't have to have been an assistant psychologist, there are other ways to get experience (but all will involve a pay cut for you!).
I will caution that many trusts have hiring freezes in psychology, despite increased pressure and increased clinical target to reduce waiting times (essentially see more patients with no more staff). There is a lot of pressure on the profession to account for every minute, and a lot of hurt and upset people when they finally get to your appointment after waiting years. It'd not do a different job but it's not easy and it's often morally challenging working in such a broken system.
Alternatives that might be of interest are speech and language or OT. Have a think about what it is you want from this career change - I changed because I wanted to feel I was needed (not sure what that says about me!) and wanted to be a key part of an MDT. OT colleagues do lots of independent interventions, and a lot of their work is very much psychology at the core (particularly when in a mh setting, but arguably in all settings). For example, identifying values and working with people to live aligned with values to improve wellbeing whilst working with physical or mental barriers (aligns with therapies such as ACT and CFT) and some exposure type work also (helping build resilience and confidence in feared situations). SaLT (and OT actually) do comprehensive assessments and give clinical opinion and intervention based on this - both cognitively and more language specific, to the extent that I will often defer to salt cognitive assessments rather than perform full batteries myself as their insights are often more practical and applied to the real world.
Both careers would "only" require 3 years (rather than 1/2 conversion and 3 years doctorate with a thesis, plus experience in between) and would get you working in the field far quicker and are very rewarding, hands on jobs.
It depends what you want, but you are age being in a different field now is not a reason not to.