Not sure if you're eligible to take part? Text your full name and date of birth to 07772 90 90 90 or email firstname.lastname@example.org to find out.
Children of the 90s is a multi-generational study that’s unique for the breadth and depth of its data, and the information and samples you've given us have already informed more than 2,000 research papers on some of the most pressing health questions of our time, including childhood obesity, air pollution and mental health.
It’s never too late to get back in touch, however long it's been since you last took part, and you can choose how little or how much to get involved.
Read about how we're contributing to vital COVID-19 research