No.1 Best-Selling Book

100 Days to a Younger Brain

A transformative guide that turns cutting-edge neuroscience into daily habits.
Written by Dr Sabina Brennan, this Irish Times No.1 best-seller offers a 100-day plan filled with powerful, science-backed techniques to boost memory, improve focus and future-proof your brain against decline.

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About the Book

What’s Inside?

100 Days to a Younger Brain translates groundbreaking neuroscience into easy, daily actions. This book acts like a couch-to-10K for your brain – helping you adopt lifestyle habits proven to enhance memory, reduce cognitive decline and improve mental agility.

Whether you’re looking to reduce dementia risk, improve focus or simply feel sharper, this book empowers you to take control of your brain health – one day at a time.

Praise & Reviews

What Readers & Critics Say

Emerald Street
'A couch to 10K for your brain… Everyone should buy this book.'
The Outlook
'Packed with essential information - it’s like a brain training plan you’ll actually stick to.
Irish Catholic
'Riveting, relatable and practical. Sabina Brennan makes brain science accessible to everyone.'

Build focus, memory, and mental agility with 100 simple, science-backed actions.

Step-by-step guidance that’s easy to follow — and designed to stick.

Adopt habits that actively protect against dementia and age-related memory loss.

Complex neuroscience made relatable, empowering you to take charge of your brain health.

You can’t change your age — but you can change how your brain ages.

You can’t change your age — but you can change how your brain ages

Dr Sabina Brennan