How old can a PHP programmer be?

Let me share a question with you, how old can you be as a PHP programmer? I'm 32 this year, and I'm thinking about whether to be a full-time programmer or just outsource and write programs part-time. I’m worried about the pension issue. What if no one wants me after I work until I’m 40? Can you guys give me some advice? Thank you

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I'm going to write code for 50 years and have been doing it for 48 years

<code class="language-text">本周我就要 69 岁了。
从 1967 年开始，我就一直在编程，从 COBOL 到 jQuery，已有 48 年了。
我忘掉的编程语言数量，比大多数程序员遇到的还要多。
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