I am 62 years old and a 1099 employee with 70K in income. How much can I contribute to a SEP plan?

[JillS56]

For a self-employed individual, contributions are limited to 25% of your net earnings from self-employment (not including contributions for yourself), up to $61,000 for 2022 ($58,000 for 2021; $57,000 for 2020).

Here is an article on how much you can Contribution to a SEP plan.

[SweetieJean]

1099 employee

Just to clarify, an employee gets a W-2.  Since you get a 1099, you are an independent contractor.