Brands often focus testing on particular age groups based on who uses, buys, or influences the product. Here’s why:

1. Relevance of Experience
   Testing works best with people who actually use the product regularly, so feedback is more accurate and meaningful.

2. Target Consumer Needs
   Different age groups have different lifestyles, preferences, and priorities- testing helps ensure the product meets the right needs.

3. Purchase Decision Insight
   Brands want insights from the person making purchase decisions, not just users. If 35-year-old parents are the ones picking laundry products during a grocery shop, their opinions matter most to sales.

4. Life Stage Differences
   Needs can vary widely by age or life stage- for example, a parent may value practicality, while a younger person may look for style or innovation.

5. Innovation & Trends
   New formats or ideas are often tested with younger, trend-aware consumers who are more open to trying something new.

Example:
If a laundry brand is testing a fragrance-forward detergent, it might target 25–40-year-olds who care about how clothes smell. If it’s testing a hypoallergenic, fragrance-free version, it might focus on parents of babies or older adults with sensitive skin.