# Where to watch Just Because You're Grown-Up (1970) in the UK

> Just Because You're Grown-Up (1970) is not currently listed on any UK streaming, rental, or purchase service. Last verified on 16 May 2026 by ScreenSearch.

**Type:** Film  
**Year:** 1970  
**Runtime:** 83 minutes  
**TMDB rating:** 10.0/10  
**Genres:** Family  
**Region:** United Kingdom (GB)  
**Last verified:** 16 May 2026 (2026-05-16T09:38:57.866Z)  

## Synopsis

Eleven-year old Mísa has the temperament of a proper boy and endless problems with the grown-ups. It is no wonder that he longs to become an adult without further delay. Mísa keeps house together with his father and has various duties. After a failed attempt at dish-washing he goes off to the research institute where his father is working on an important invention. He is trying to produce a substance that would make poultry and other animals bigger and thus help the struggle against famine in the world, but so far he has only managed to produce a shrinking substance. After his father leaves the laboratory, Mísa mixes up different ingredients and makes the growth substance. He drinks it and instantly becomes an adult. His father, conversely, turns into a toddler after drinking the shrinking substance with his beer by mistake.

## Streaming options in the United Kingdom

No current UK streaming, rental, or purchase listings were found for Just Because You're Grown-Up in our daily-updated TMDB feed. The title may be on physical media only, awaiting UK release, or in a temporary licensing gap.

## Frequently asked questions

**Where can I watch Just Because You're Grown-Up in the UK?**

Just Because You're Grown-Up (1970) is not currently listed by any UK streaming, rental, or purchase service in our daily-updated TMDB feed. It may be on physical media, an aggregator, or pending a UK release. Check back later — availability changes frequently.

**Is Just Because You're Grown-Up on Netflix, Disney+ or Amazon Prime Video in the UK?**

Just Because You're Grown-Up is not currently included with any major UK subscription service. It may still be available to rent or buy.

**How accurate is this film's availability data?**

Availability is sourced from The Movie Database (TMDB), which in turn pulls from JustWatch. Listings are refreshed daily. For purchase decisions, the provider's own site is the source of truth.

## Sources

- Streaming availability: The Movie Database (TMDB), refreshed daily.
- Underlying licensing data: JustWatch.
- Canonical URL: https://www.screensearch.co.uk/watch/movie/345079/just-because-you-re-grown-up-1970
- JSON variant: https://www.screensearch.co.uk/watch/movie/345079/just-because-you-re-grown-up-1970.json

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