Investigate language development across the lifespan.Watch Language
Read Speech and Language Development Milestones
And What is Voice, What is Speech, What is Language
Investigate the other areas of the site to develop an understanding of different things that can disrupt normal speech development across the lifespan. One interesting page on normal development is Your Baby’s Hearing and Communication Checklist
Use the NIH resources such as Autism Spectrum Disorder: Communication Problems in Children, or Dysphagia, or any other problem associated with language development or usage that occurs any time during the lifespan.
Hold a conversation with individuals from different age groups between toddler through old age. You do not need to ask specific questions but rather talk about general everyday things. It idea is to investigate the language skills and usage of individuals at different ages, such as extent of vocabulary, depth of discussion, etc. Write up your observation and analysis.