The ELC Co. UK makes toys for baby and toddlers, so any age group from 1 years old to 10 years old should be a good range. If I find the product to be good, I might even use it for older kids.
The ELC stands for the English Learning or Language Center. The age at which students are accepted at the ELC is approximately eighteen years of age as well.
Leapfrog Toys are only for young children. The youngest age groups is for children 0-3, the middle 3-6, and the oldest 6-7. All toys are very educational and helpful for young and growing children.
Riding toys are usually targeted towards younger children in the age groups under 8. Some ride-on toys are mechanical and require hand-eye coordination and are geared towards the older children.
Monster Jam Toys are for people of all age groups. The cars and trucks under the brand "Hot Wheels" are generally for younger children, ages 3-5. Other Monster Jam Toys are for children ages 5-13.
The Furby Boom Peacock is intended for use by children over the age of 6. I would recommend that you look to sites like Toys-R-Us, which offer the option of searching for toys by age range.
These toys are marketed for the age group of three to sixteen. Children younger than this age group should not play with these toys as they can pose as a choking hazard.
It does not seem that there is a specific set age group for hovercraft toys, but I would highly suggest an older, 5-10 type of age group. Get an idea of them here. http://www.nextag.com/Toys--zzwholesale+radio+control+hovercraftz2700600zB6z5---html
The Leap Frog website have different groups of toys for children from birth thru 8+ years of age. Having had a child growing up using this brand of your, I would suggest that 8 is the upper limit.
The packaging will tell you the age groups, and if they are safe for your child's age. Always read the packaging.
LeapFrog electronic toys are especially designed to withstand much wear-and-tear from toddlers and preschoolers while maintaining their quality. Since they are specifically geared for these age groups, the design and material that go into making them will withstand the abuse from younger age groups.
These toys are made for different age groups. Normally 12 months is the average age children start with blocks although at that young of an age you cannot expect to much from them, at age 3 they should more than likely be building with the blocks.
For teenage boys, I recommend you go to Amazon.com and drill down to the best recommended toys for your age group. That will give you an idea as to what is popular with customers who buy at that website. If your boys are gamers, go to the GameStop website and check out what are the popular games for the applicable age groups.